| 摘要 |
A substantially flat, aperture-coupled antenna element of the kind comprising a multilayer structure with a radiating patch (2) arranged on a dielectric layer (1), an electrically conductive ground plane layer (3) having a cross-shaped aperture (4) with two crossing slots (4a, 4b) being centered in relation to the patch, and a dielectric board provided with a feed network (6) for feeding microwave energy via feed elements (7, 8) and said cross-shaped aperture (4) to said patch so as to cause the latter to generate a dual polarized microwave beam propagating from the antenna element. The multilayer structure includes a single dielectric board (5) provided with a planar feed network (6) having a first feed element (7) with a pair of feed lines extending symmetrically on each side of the aperture centre (4c) and a second feed element (8) with a single feed line located unsymmetrically at one said of said aperture centre without crossing said first feed element, the two feed elements (8, 7) being oriented and dimensioned so as to excite each one of the slots (4a, 4b) separately from a respective microwave channel. |
